This catechism was written by Zacharias Ursinus (1534-1583) and Caspar Olevianus (1536-1584) in Heidelberg, Germany and published in 1563 in German. It was endorsed by the Synod of Dort and embraced by Reformed Churches in many different countries. It is the custom of many churches that use it to explain it from the pulpit every week throughout the year on Sunday afternoon, so it is divided into fifty-two sections.